Yes, by intersecting them.
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You cannot make four triangles our of a quadrilateral by ONE line through it. One line can give you at most two triangles. Two lines, each running from one vertex of the quadrilateral to the opposite vertex, will give 4 triangles.
Yes. 4 Triangles Can Turn Into 8 Triangles.
you can't
They make four triangles, not a triangle.
Put the triangles in a line alternately pointing up and down.